A second grader and a friend of Takahiro's who lives quite close to him. Mio enjoys watching jousting competitions and strongly believes that Takahiro will eventually recover from his injury and return to competing. Mio is good at housework, but her food sucks as she adds odd seasonings and makes weird cuisine.

Bertille gave her the nickname "Miracle Knight."

She surprisingly ends up placing 2nd (runner-up) at the summer tournament.